package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * @author 刘宇
 */
@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

    /**
     * 指定时间区间的营业额数据
     * @param startDate
     * @param endDate
     * @return
     */
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate startDate, LocalDate endDate) {
        //计算日期
        //用于存放从begin到end范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(startDate);
        while(!startDate.equals(endDate)){
            //计算指定日期后一天的日期
            startDate = startDate.plusDays(1);
            dateList.add(startDate);
        }

        //获得营业额数据
        //存放每天的营业额
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate localDate : dateList) {
            //select sum(amount) from orders where order_time>begin and order_time<end_time and status=5
            //开始时间 编写为年月日时分秒格式
            LocalDateTime begin = LocalDateTime.of(localDate, LocalTime.MIN);
            LocalDateTime end=LocalDateTime.of(localDate,LocalTime.MAX);
            Map map = new HashMap();
            map.put("begin",begin);
            map.put("end",end);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            turnover=turnover==null?0.0:turnover;
            turnoverList.add(turnover);
        }
        TurnoverReportVO turnoverReportVO = new TurnoverReportVO();
        turnoverReportVO.setDateList(StringUtils.join(dateList,","));
        turnoverReportVO.setTurnoverList(StringUtils.join(turnoverList,","));
        return turnoverReportVO;
    }

    /**
     * 统计指定时间区间的用户数据
     * @param startDate
     * @param endDate
     * @return
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate startDate, LocalDate endDate) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(startDate);
        while(!startDate.equals(endDate)){
            startDate = startDate.plusDays(1);
            dateList.add(startDate);
        }
        //存放每天的新增的用户数量 select count(id)from user where create_time <? and create_time>?
        List<Integer> newUserList = new ArrayList<>();
        //存放每天总的用户数量 select count(id) from user where create_time < ?
        List<Integer> totalUserList = new ArrayList<>();
        //获得当前日期的初始和结束
        for (LocalDate localDate : dateList) {
            LocalDateTime begin=LocalDateTime.of(localDate,LocalTime.MIN);
            LocalDateTime end=LocalDateTime.of(localDate,LocalTime.MAX);
            Map map =new HashMap();
            map.put("end",end);
            Integer totalUser = userMapper.countByMap(map);
            //总用户数量
            map.put("begin",begin);
            Integer newUser=userMapper.countByMap(map);
            totalUser=totalUser==null?0:totalUser;
            totalUserList.add(totalUser);
            newUser=newUser==null?0:newUser;
            newUserList.add(newUser);
        }
        return UserReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .build();
    }

    /**
     * 订单统计
     * @param start
     * @param over
     * @return
     */
    @Override
    public OrderReportVO getOrderStatistics(LocalDate start, LocalDate over) {
        //日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(start);
        while(!start.equals(over)){
            start=start.plusDays(1);
            dateList.add(start);
        }
        //每日订单数
        List<Integer> orderCountList = new ArrayList<>();
        //每日有效订单数
        List<Integer> validOrderCountList = new ArrayList<>();
        for (LocalDate localDate : dateList) {
            //获取 yyyy-MM-dd-hh-mm-ss格式的日期
            LocalDateTime begin = LocalDateTime.of(localDate,LocalTime.MIN);
            LocalDateTime end = LocalDateTime.of(localDate,LocalTime.MAX);

            //当日所有订单数 select count(id) from orders where order_time > #{begin} and order_time<end
            Integer orderCounts = getOrderCount(begin,end,null);
            //当日有效订单数 select count(id) from orders where order_time > #{begin} and order_time<end and status=#{status}
            Integer validOrderCounts =getOrderCount(begin,end,Orders.COMPLETED);
            //存放数据
            orderCountList.add(orderCounts);
            validOrderCountList.add(validOrderCounts);
        }
        //总订单数 select count(id) from orders
        Integer totalOrderCount =orderMapper.countByStatus(null);
        //有效订单数 select count(id) from orders where status=#{status}
        Integer validOrderCount= orderMapper.countByStatus(Orders.COMPLETED);
        //订单完成率
        Double orderCompletionRate = 0.0;
        if(totalOrderCount!=0){
            orderCompletionRate=validOrderCount.doubleValue()/totalOrderCount;
        }
        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .orderCountList(StringUtils.join(orderCountList,","))
                .validOrderCountList(StringUtils.join(validOrderCountList,","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 销量排名top10
     * @param begin
     * @param end
     * @return
     */
    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin,LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end,LocalTime.MAX);
        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime,endTime);
        List<String>names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names,",");
        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");
        return SalesTop10ReportVO
                .builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    /**
     * 根据条件统计订单数量
     * @param begin
     * @param end
     * @param status
     * @return
     */
    private Integer getOrderCount(LocalDateTime begin, LocalDateTime end,Integer status) {
        Map map =new HashMap();
        map.put("begin",begin);
        map.put("end",end);
        map.put("status",status);
        return orderMapper.countByMap(map);
    }

    /**
     * 导出运营数据报表
     * @param response
     */
    public void exportBusinessData(HttpServletResponse response) {
        //1. 查询数据库，获取营业数据---查询最近30天的运营数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);

        //查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));

        //2. 通过POI将数据写入到Excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

        try {
            //基于模板文件创建一个新的Excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);

            //获取表格文件的Sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");

            //填充数据--时间
            sheet.getRow(1).getCell(1).setCellValue("时间：" + dateBegin + "至" + dateEnd);

            //获得第4行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());

            //获得第5行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            //填充明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = dateBegin.plusDays(i);
                //查询某一天的营业数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                //获得某一行
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

            //3. 通过输出流将Excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //关闭资源
            out.close();
            excel.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}
